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Makoto Kimura - One of the best experts on this subject based on the ideXlab platform.
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comparison of bacterial community structures at main habitats in paddy field ecosystem based on dgge analysis
Soil Biology & Biochemistry, 2008Co-Authors: Susumu Asakawa, Makoto KimuraAbstract:Abstract Bacterial communities at different habitats in a Japanese paddy field ecosystem were compared to understand the bacterial world in the ecosystem as a whole by analyzing data of the denaturing gradient gel electrophoresis (DGGE) band patterns and the sequenced DGGE bands. The habitats were floodWater, Percolating Water, microcrustacean inhabiting in floodWater, plow layer soil, rice roots, rice straw and rice straw compost incorporated in soil, rice straw placed on the soil surface, plant residues in paddy fields, and rice straw under composting process. Phylotype (band) richness, diversity, evenness, and stability of the bacterial communities at the respective habitats were evaluated based on the DGGE profile data. Phylotype richness was greater near plant residues, rice straw buried in soil and rice straw placed on soil surface, while it was smaller at microcrustacean and rice straw compost buried in soil. The samples from plow layer soil and rice straw compost buried in soil showed considerably higher index values for diversity, evenness, and stability, while those from rice straw placed on soil surface and microcrustacean had lower values of the indices than other habitats. Sequences of totally 250 DGGE bands were assigned to phyla or classes. Distribution of bacterial members to phylogenetic taxa was different among the respective habitats. Inhabitants in plow layer soil were most widely distributed among the groups (nine phyla: Proteobacteria, Chloroflexi, Chlorobi, Verrucomicrobia, Acidobacteria, Nitrospira, candidate division OP10, Cyanobacteria, and Actinobacteria), while those in floodWater and microcrustacean were restricted to only three phyla (Proteobacteria, Bacteroidetes, and Actinobacteria). Proteobacteria and Bacteroidetes were found at all the habitats and the habitats except for plow layer soil, respectively, whereas abundant members belonged to Chloroflexi and Actinobacteria in plow layer soil. “Comprehensive mapping” of DGGE fragments was conducted by principal component analysis based on evolutionary distances of the fragments to 202 reference bacterial strains to overview phylogenetic relationships of bacterial members among the respective habitats. The score plots with the first and second principal components distinctly characterized bacterial members at the respective habitats, and the similarity between the respective communities was clearly demonstrated. Overall, bacterial communities at the respective habitats were distinct and different in the diversity and stability to each other, which may have contributed to the diversity of overall bacterial communities in the paddy field ecosystem.
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incorporation of 13c labeled rice straw derived carbon into microbial communities in submerged rice field soil and Percolating Water
Soil Biology & Biochemistry, 2006Co-Authors: Jun Murase, Yuri Matsui, Masahiko Katoh, Atsuko Sugimoto, Makoto KimuraAbstract:Rice straw is a major organic material applied to rice fields. The microorganisms growing on rice-straw-derived carbon have not been well studied. Here, we applied 13C-labeled rice straw to submerged rice soil microcosms and analyzed phospholipid fatty acids (PLFAs) in the soil and Percolating Water to trace the assimilation of rice-straw-derived carbon into microorganisms. PLFAs in the soil and Water were markedly enriched with 13C during the first 3 days of incubation, which indicated immediate incorporation of rice-straw-derived carbon into microbial biomass. The enrichment of PLFAs in the Percolating Water with 13C suggested that microorganisms other than the population colonizing rice straw also assimilated rice-straw-derived carbon or that some bacterial groups were selectively released from the straw. The microbial populations could be categorized into two communities based on the carbon isotope data of the PLFAs: those derived from rice straw and those derived from soil organic matter (SOM). The composition of the PLFAs from the two communities differed, which indicated the assimilation of rice-straw-derived carbon by a subset of microbial populations. The composition of rice-straw-derived PLFAs in the Percolating Water was also distinct from that in the soil.
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effect of rice straw amendment on dissolved organic and inorganic carbon and cationic nutrients in Percolating Water from a flooded paddy soil a microcosm experiment using 13c enriched rice straw
Organic Geochemistry, 2005Co-Authors: Masahiko Katoh, Jun Murase, Atsuko Sugimoto, Makoto KimuraAbstract:Abstract A flooded soil column experiment was conducted in which 13C-enriched rice straw (RS; 7.0 g kg−1 dry weight soil) was added to evaluate the effects of RS application on the leaching of cationic nutrients (Ca, Mg, and Fe), dissolved inorganic carbon (DIC), dissolved organic carbon (DOC) and CH4 from the plow layer of rice paddies by Water percolation. The origins of these nutrients in rice paddy soil were studied by comparing their content in the soil before and after the percolation experiment. The proportion of total cationic nutrients in Percolating Water to the content of exchangeable Ca, Mg and amorphous Fe in the soil during the 111 d experiment increased from 21% to 46% for Ca, 34–61% for Mg, and 4.5–14% for Fe as a result of RS application at 25 °C. The decrease in exchangeable Ca, Mg and amorphous Fe after the experiment were comparable to the total amounts detected in the Percolating Water, suggesting that these cationic nutrients in the Water were derived from exchangeable Ca, Mg and amorphous Fe in the soil. The application of RS increased DIC and CH4 leaching more than twofold compared to a control experiment in which 13C-enriched RS was not applied. The contribution of RS carbon to DIC, DOC and CH4 in Percolating Water was 80, 23 and 70%, respectively. The application of RS was shown to suppress the decomposition of soil organic matter, based upon measurement of a low 12C content of DIC in the Percolating Water.
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vertical changes in bacterial communities in Percolating Water of a japanese paddy field as revealed by pcr dgge
Soil Science and Plant Nutrition, 2005Co-Authors: Jun Murase, Miho Shimizu, Motoki Hayashi, Kazuo Matsuya, Makoto KimuraAbstract:Percolating Water was sampled from the plow layer and subsoil layer in a Japanese paddy field, and the bacterial communities were compared together with floodWater by polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) targeting a partial 16S rRNA gene and subsequent sequencing. The number of DGGE bands ranged from 16 to 28 with no significant differences among the sampling sites and times. Only 2 bands were common for the three sources of Water samples. DGGE bands specific for the floodWater samples and Percolating Water samples from the plow layer were identified, while Percolating Water samples from the subsoil layer did not show specific bands but displayed common bands to those of the floodWater samples (7 bands) and Percolating Water samples from the plow layer (1 band). Cluster analysis of the DGGE banding patterns showed a distinct clustering in the samples of Percolating Water from the plow layer and a closer relationship between the others. These results suggest that the...
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carbon cycling in rice field ecosystems in the context of input decomposition and translocation of organic materials and the fates of their end products co2 and ch4
Soil Biology & Biochemistry, 2004Co-Authors: Makoto Kimura, Jun Murase, Yahai LuAbstract:Abstract Rice fields are intensively managed, unique agroecosystems, where soil flooding is general performance for rice cultivation. Flooding the field results in reductive soil conditions, under which decomposition of organic materials proceeds during the period of rice cultivation. A large variety of organic materials are incorporated into rice soils according to field management. In this review, the kind and abundance of organic materials entering carbon cycling in the rice field ecosystem are evaluated first. Then, decomposition of plant residues and soil organic matter in rice fields is reviewed quantitatively. Decomposition of plant residues is shown to be the active process in carbon cycling in rice fields. Rice releases photosynthates into the rhizosphere (rhizodeposition), and they follow a different avenue of decomposition in soil from that of plant residues. Incorporation of rhizodeposition into microbial biomass and soil organic matter during the period of rice cultivation, and their fates after harvesting are evaluated quantitatively from 13C pulse labeled experiments. Percolating Water transports inorganic and organic carbon from the plow layer to the subsoil layer. The amounts of their transport and accumulation in the subsoil layer are evaluated in relation to the amounts of soil organic C in the plow layer. Not only CO2 but also CH4 are produced in the decomposition process of organic materials in flooded rice fields. CH4 evolution from rice fields is of global concern from the viewpoint of global warming. Origins of CH4 evolved from rice fields are estimated first, followed by the fates of CH4 in rice field ecosystems. Rhizodeposition is shown to be the main origin of CH4 evolved from rice fields. Evolution to the atmosphere is not the sole pathway of CH4 produced in rice fields. The amounts of CH4 retained in soil, percolated to the subsoil layer and decomposed in soil are evaluated in the context of the amounts of CH4 efflux. Thus, this review focuses on carbon cycling in the rice field ecosystem from the viewpoints of input, decomposition, and translocation of organic materials and the fates of their end products (CO2 and CH4).
Jun Murase - One of the best experts on this subject based on the ideXlab platform.
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incorporation of 13c labeled rice straw derived carbon into microbial communities in submerged rice field soil and Percolating Water
Soil Biology & Biochemistry, 2006Co-Authors: Jun Murase, Yuri Matsui, Masahiko Katoh, Atsuko Sugimoto, Makoto KimuraAbstract:Rice straw is a major organic material applied to rice fields. The microorganisms growing on rice-straw-derived carbon have not been well studied. Here, we applied 13C-labeled rice straw to submerged rice soil microcosms and analyzed phospholipid fatty acids (PLFAs) in the soil and Percolating Water to trace the assimilation of rice-straw-derived carbon into microorganisms. PLFAs in the soil and Water were markedly enriched with 13C during the first 3 days of incubation, which indicated immediate incorporation of rice-straw-derived carbon into microbial biomass. The enrichment of PLFAs in the Percolating Water with 13C suggested that microorganisms other than the population colonizing rice straw also assimilated rice-straw-derived carbon or that some bacterial groups were selectively released from the straw. The microbial populations could be categorized into two communities based on the carbon isotope data of the PLFAs: those derived from rice straw and those derived from soil organic matter (SOM). The composition of the PLFAs from the two communities differed, which indicated the assimilation of rice-straw-derived carbon by a subset of microbial populations. The composition of rice-straw-derived PLFAs in the Percolating Water was also distinct from that in the soil.
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effect of rice straw amendment on dissolved organic and inorganic carbon and cationic nutrients in Percolating Water from a flooded paddy soil a microcosm experiment using 13c enriched rice straw
Organic Geochemistry, 2005Co-Authors: Masahiko Katoh, Jun Murase, Atsuko Sugimoto, Makoto KimuraAbstract:Abstract A flooded soil column experiment was conducted in which 13C-enriched rice straw (RS; 7.0 g kg−1 dry weight soil) was added to evaluate the effects of RS application on the leaching of cationic nutrients (Ca, Mg, and Fe), dissolved inorganic carbon (DIC), dissolved organic carbon (DOC) and CH4 from the plow layer of rice paddies by Water percolation. The origins of these nutrients in rice paddy soil were studied by comparing their content in the soil before and after the percolation experiment. The proportion of total cationic nutrients in Percolating Water to the content of exchangeable Ca, Mg and amorphous Fe in the soil during the 111 d experiment increased from 21% to 46% for Ca, 34–61% for Mg, and 4.5–14% for Fe as a result of RS application at 25 °C. The decrease in exchangeable Ca, Mg and amorphous Fe after the experiment were comparable to the total amounts detected in the Percolating Water, suggesting that these cationic nutrients in the Water were derived from exchangeable Ca, Mg and amorphous Fe in the soil. The application of RS increased DIC and CH4 leaching more than twofold compared to a control experiment in which 13C-enriched RS was not applied. The contribution of RS carbon to DIC, DOC and CH4 in Percolating Water was 80, 23 and 70%, respectively. The application of RS was shown to suppress the decomposition of soil organic matter, based upon measurement of a low 12C content of DIC in the Percolating Water.
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vertical changes in bacterial communities in Percolating Water of a japanese paddy field as revealed by pcr dgge
Soil Science and Plant Nutrition, 2005Co-Authors: Jun Murase, Miho Shimizu, Motoki Hayashi, Kazuo Matsuya, Makoto KimuraAbstract:Percolating Water was sampled from the plow layer and subsoil layer in a Japanese paddy field, and the bacterial communities were compared together with floodWater by polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) targeting a partial 16S rRNA gene and subsequent sequencing. The number of DGGE bands ranged from 16 to 28 with no significant differences among the sampling sites and times. Only 2 bands were common for the three sources of Water samples. DGGE bands specific for the floodWater samples and Percolating Water samples from the plow layer were identified, while Percolating Water samples from the subsoil layer did not show specific bands but displayed common bands to those of the floodWater samples (7 bands) and Percolating Water samples from the plow layer (1 band). Cluster analysis of the DGGE banding patterns showed a distinct clustering in the samples of Percolating Water from the plow layer and a closer relationship between the others. These results suggest that the...
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carbon cycling in rice field ecosystems in the context of input decomposition and translocation of organic materials and the fates of their end products co2 and ch4
Soil Biology & Biochemistry, 2004Co-Authors: Makoto Kimura, Jun Murase, Yahai LuAbstract:Abstract Rice fields are intensively managed, unique agroecosystems, where soil flooding is general performance for rice cultivation. Flooding the field results in reductive soil conditions, under which decomposition of organic materials proceeds during the period of rice cultivation. A large variety of organic materials are incorporated into rice soils according to field management. In this review, the kind and abundance of organic materials entering carbon cycling in the rice field ecosystem are evaluated first. Then, decomposition of plant residues and soil organic matter in rice fields is reviewed quantitatively. Decomposition of plant residues is shown to be the active process in carbon cycling in rice fields. Rice releases photosynthates into the rhizosphere (rhizodeposition), and they follow a different avenue of decomposition in soil from that of plant residues. Incorporation of rhizodeposition into microbial biomass and soil organic matter during the period of rice cultivation, and their fates after harvesting are evaluated quantitatively from 13C pulse labeled experiments. Percolating Water transports inorganic and organic carbon from the plow layer to the subsoil layer. The amounts of their transport and accumulation in the subsoil layer are evaluated in relation to the amounts of soil organic C in the plow layer. Not only CO2 but also CH4 are produced in the decomposition process of organic materials in flooded rice fields. CH4 evolution from rice fields is of global concern from the viewpoint of global warming. Origins of CH4 evolved from rice fields are estimated first, followed by the fates of CH4 in rice field ecosystems. Rhizodeposition is shown to be the main origin of CH4 evolved from rice fields. Evolution to the atmosphere is not the sole pathway of CH4 produced in rice fields. The amounts of CH4 retained in soil, percolated to the subsoil layer and decomposed in soil are evaluated in the context of the amounts of CH4 efflux. Thus, this review focuses on carbon cycling in the rice field ecosystem from the viewpoints of input, decomposition, and translocation of organic materials and the fates of their end products (CO2 and CH4).
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comparison of microbial communities in Percolating Water from plow layer and subsoil layer estimated by phospholipid fatty acid plfa analysis
Soil Science and Plant Nutrition, 2002Co-Authors: Miho Shimizu, Jun Murase, Motoki Hayashi, Kazuo Matsuya, Makoto KimuraAbstract:Abstract The amount and composition of phospholipid fatty acids (PLFAs) in the Percolating Water taken from different depths of soil (10 cm, PW10; 40 cm, PW40) and floodWater (FW) in a paddy field were compared during the period of rice cultivation. The amounts of PLFAs in PW10, PW40, and FW ranged from 22.6 to 46.2 μg L−1, from 22.3 to 54.5 μg L−1, and from 82.9 to 179.0 μg L−1, respectively. The PLFA profiles in PW10, PW40, and FW were similar to each other and 16 : 1ω7c, 18 : 1ω7, and 16 : 0 PLFAs were dominant components, irrespective of the sampling site and sampling time. High proportions of straight mono-unsaturated PLFAs ranging from 42.0 to 76.5% suggested that Gram-negative bacteria were the major members in the microbial communities of the Water samples studied. A potential indicator of the environmental stresses imposed upon the microbiota that was represented by the trans vs. cis ratio of 16 : 17 PLFA was constantly low (< 0.05), indicating that the microbial communities at these sites were h...
Anton Brancelj - One of the best experts on this subject based on the ideXlab platform.
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two new stygobiotic species of elaphoidella crustacea copepoda harpacticoida with comments on geographical distribution and ecology of harpacticoids from caves in thailand
Zootaxa, 2015Co-Authors: Santi Watiroyram, Anton Brancelj, Laorsri SanoamuangAbstract:Elaphoidella thailandensis sp. nov. and E. jaesornensis sp. nov., collected during an investigation of cave-dwelling copepod fauna in the northern part of Thailand, are described and figured herein. The new species were collected from pools filled by Percolating Water from the unsaturated zone of a karstic aquifer in Phitsanulok and Lampang Provinces, respectively. Elaphoidella thailandensis, from Tham Khun cave, is distinguished from its congeners by the two-segmented endopod of pediger 1, the absence of endopod on pediger 4, and the setal formula 4, 5, 6 for the distal exopodal segment of pedigers 2–4. Elaphoidella jaesornensis, from Tham Phar Ngam cave, is distinguished from its most closely related species, E. namnaoensis Brancelj, Watiroyram & Sanoamuang, 2010, by the armature formula of the endopod of pedigers 2–5. The geographical distribution and ecology of Harpacticoida from Thai caves is also presented.
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a new bryocyclops kiefer crustacea copepoda cyclopoida from karstic caves in thailand
2012Co-Authors: Santi Watiroyram, Anton Brancelj, Laorsri SanoamuangAbstract:Bryocyclops maewaensis, new species, collected from a karstic cave in Lampang Province, (northern Thailand), is described. The new species can be distinguished from its congeners by several morphological characters, which include body ornamentation, the shape of anal operculum, three reduced- setae on P4 endopod-2 of the female, and particularly the modifi ed spine on P3 endopod-2 of the male. It is most similar to B. anninae (Menzel, 1926), originally described from moist moss in Java. This is the fi rst record of the genus in Thailand and the second representative of cave-dwelling Copepoda there. This species has so far been found only from pools fi lled with Percolating Water from the unsaturated zone of a karstic aquifer.
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the first record of cave dwelling copepoda from thailand and description of a new species elaphoidella namnaoensis n sp copepoda harpacticoida
Crustaceana, 2010Co-Authors: Anton Brancelj, Laorsri Sanoamuang, Santi WatiroyramAbstract:During a brief collecting expedition in Nam Nao National Park, Phetchabun province (northern Thailand) in November 2007, various Water bodies connected with subterranean Water were sampled. In five caves, eight samples were collected from pools and six species of Copepoda were collected. For the first time, a stygobiotic (= cave-dwelling) species of Copepoda was discovered in Thailand. It belongs to the order Harpacticoida and was recognized as a new species, Elaphoidella namnaoensis n. sp. Specimens were only collected from pools filled by Percolating Water. This indicates a specific ecology of the new species, linked to the unsaturated zone of karstic aquifers, where the hydrology is determined exclusively by rainfall. A detailed description of the new species is presented here, supplemented with some information on its ecology and morphological adaptations. These adaptations are compared to those found in other Elaphoidella species from the unsaturated zone of karstic aquifers in Europe. Au cours d'une breve mission de recolte au Parc National de Nam Nao, province de Phetchabun (nord de la Thailande) en novembre 2007, des collections d'eau variees en relation avec les eaux souterraines ont ete echantillonnees. Dans cinq grottes, huit echantillons ont ete recoltes dans des bassins et six especes de copepodes ont ete obtenues. Pour la premiere fois, une espece stygobie (vivant dans les grottes) de copepodes a ete decouverte en Thailande. Elle appartient a l'ordre des Harpacticoida et a ete reconnue comme une espece nouvelle: Elaphoidella namnaoensis n. sp. Les specimens ont ete recueillis seulement dans les bassins remplis d'eau de percolation. Ceci indique une ecologie particuliere pour cette nouvelle espece, liee a la zone insaturee de l'aquifere karstique, ou l'hydrologie est determinee exclusivement par les precipitations. Une description detaillee de la nouvelle espece est presentee ici, completee par des informations sur son ecologie et ses adaptations morphologiques. Ces adaptations sont comparees a celles rencontrees chez d'autres Elaphoidella de la zone insaturee des aquiferes karstiques d'Europe.
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Fauna of an unsaturated karstic zone in Central Slovenia: two new species of Harpacticoida (Crustacea: Copepoda), Elaphoidella millennii n. sp. and E. tarmani n. sp., their ecology and morphological adaptations
Hydrobiologia, 2008Co-Authors: Anton BranceljAbstract:The unsaturated zone in fissured (= karstic) aquifers continues to be a source of new species of Harpacticoida (Crustacea: Copepoda). The first species were discovered about 70 years ago in the Skocjanske Jame Cave in Slovenia. Intensive sampling of Percolating Water in caves there over the last 20 years has yielded several new species, some of them well adapted to that environment. The most recent studies revealed that such a specialised fauna is also present in other regions of Europe, South and North America, and Asia. In Europe, three genera belonging to the order Harpacticoida are characteristic of the unsaturated karstic zone: Morariopsis, Paramorariopsis and Elaphoidella. In this article, two highly specialised species of Elaphoidella are described. A detailed analysis of their ecology and morphological adaptations along with other species of the genus Elaphoidella from Slovenia is included, and comparisons are made with the epikarstic genera Morariopsis and Paramorariopsis.
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Microdistribution and high diversity of Copepoda (Crustacea) in a small cave in central Slovenia
Hydrobiologia, 2002Co-Authors: Anton BranceljAbstract:The microdistribution and diversity dynamics of Copepoda (Crustacea) were studied in a 75 m long horizontal karstic cave in the central part of Slovenia from February to December 2000. The only Water sources in the cave are drips from Percolating Water. The cave has thin roof, varying from 2 to 10 m. The period studied was characterised by long dry periods, interspersed with several intensive rain-storms and periods of moderate rain. Water bodies were of three different types: small basins on the walls, basins on calcareous sinter on the floor and puddles in the clay. The volume of basins varied from about 0.1 l to more then 50 l. In total, 1989 specimens of 12 taxa were collected from 19 puddles and basins on eight sampling dates. One cyclopoid and eleven harpacticoid taxa were collected, three of them being new to science. All taxa but one ( Phyllognathopus vigueri ) are stygobionts. The copepod community was dominated by Speocyclops infernus , representing about one half of all copepod specimens collected in the cave. Very few copulas or egg-carrying females were observed during sampling.
Masahiko Katoh - One of the best experts on this subject based on the ideXlab platform.
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incorporation of 13c labeled rice straw derived carbon into microbial communities in submerged rice field soil and Percolating Water
Soil Biology & Biochemistry, 2006Co-Authors: Jun Murase, Yuri Matsui, Masahiko Katoh, Atsuko Sugimoto, Makoto KimuraAbstract:Rice straw is a major organic material applied to rice fields. The microorganisms growing on rice-straw-derived carbon have not been well studied. Here, we applied 13C-labeled rice straw to submerged rice soil microcosms and analyzed phospholipid fatty acids (PLFAs) in the soil and Percolating Water to trace the assimilation of rice-straw-derived carbon into microorganisms. PLFAs in the soil and Water were markedly enriched with 13C during the first 3 days of incubation, which indicated immediate incorporation of rice-straw-derived carbon into microbial biomass. The enrichment of PLFAs in the Percolating Water with 13C suggested that microorganisms other than the population colonizing rice straw also assimilated rice-straw-derived carbon or that some bacterial groups were selectively released from the straw. The microbial populations could be categorized into two communities based on the carbon isotope data of the PLFAs: those derived from rice straw and those derived from soil organic matter (SOM). The composition of the PLFAs from the two communities differed, which indicated the assimilation of rice-straw-derived carbon by a subset of microbial populations. The composition of rice-straw-derived PLFAs in the Percolating Water was also distinct from that in the soil.
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effect of rice straw amendment on dissolved organic and inorganic carbon and cationic nutrients in Percolating Water from a flooded paddy soil a microcosm experiment using 13c enriched rice straw
Organic Geochemistry, 2005Co-Authors: Masahiko Katoh, Jun Murase, Atsuko Sugimoto, Makoto KimuraAbstract:Abstract A flooded soil column experiment was conducted in which 13C-enriched rice straw (RS; 7.0 g kg−1 dry weight soil) was added to evaluate the effects of RS application on the leaching of cationic nutrients (Ca, Mg, and Fe), dissolved inorganic carbon (DIC), dissolved organic carbon (DOC) and CH4 from the plow layer of rice paddies by Water percolation. The origins of these nutrients in rice paddy soil were studied by comparing their content in the soil before and after the percolation experiment. The proportion of total cationic nutrients in Percolating Water to the content of exchangeable Ca, Mg and amorphous Fe in the soil during the 111 d experiment increased from 21% to 46% for Ca, 34–61% for Mg, and 4.5–14% for Fe as a result of RS application at 25 °C. The decrease in exchangeable Ca, Mg and amorphous Fe after the experiment were comparable to the total amounts detected in the Percolating Water, suggesting that these cationic nutrients in the Water were derived from exchangeable Ca, Mg and amorphous Fe in the soil. The application of RS increased DIC and CH4 leaching more than twofold compared to a control experiment in which 13C-enriched RS was not applied. The contribution of RS carbon to DIC, DOC and CH4 in Percolating Water was 80, 23 and 70%, respectively. The application of RS was shown to suppress the decomposition of soil organic matter, based upon measurement of a low 12C content of DIC in the Percolating Water.
Tanja Pipan - One of the best experts on this subject based on the ideXlab platform.
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survival of the epigean dendrodrilus rubidus tenuis oligochaeta lumbricidae in a subterranean environment preživetje povrsinskega deževnika dendrodrilus rubidus tenuis oligochaeta lumbricidae v podzemeljskem okolju
2014Co-Authors: Tone Novak, Csaba Csuzdi, Tanja PipanAbstract:UDC 595.142:551.442(497.4Huda luknja) Tone Novak, Csaba Csuzdi, Franc Janžekovic, Tanja Pipan, Dusan Devetak & Sasa Lipovsek: Survival of the epigean Dendrodrilus rubidus tenuis (Oligochaeta: Lumbricidae) in a subterranean environment The peregrine earthworm dendrodrilus rubidus tenuis was regularly sampled in a Percolating Water drip originating in a habitat inaccessible to humans in the Huda luknja pri Dolicu cave, Slovenia. The reconstruction of this habitat includes both a larger passage with bat colonies supplying wet bat guano sed- iments, on which the earthworms feed, and narrow channels, which drain Water from this passage into the sampling drip. Fresh guano is deposited in autumn shortly before the earth- worms become inactive. Then, it is exploited by moulds and additionally depleted by Water washing out the nutrients be - fore the earthworms reactivate in spring. Thus, this is a rather poor food resource for the earthworms. Despite this, and apart from their short size and delayed maturation, no other distur- bance or damage was found caused by malnutrition, which was confirmed in individuals submitted to starvation in captivity. We suggest that dd. r. tenuis, which shows neither disturbance from nor adaptation to living in a subterranean environment, can subsist there because of its euryoecious character. Never- theless, in temperate climates, this is rather a harsh habitat for this earthworm.
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biodiversity and ecology of fauna in Percolating Water in selected slovenian and romanian caves
Acta Carsologica, 2007Co-Authors: Oana Teodora Moldovan, Tanja Pipan, Sanda Iepure, Andrej Mihevc, Janez MulecAbstract:Biodiversity and ecology of fauna in Percolating Water from Slovenian and Romanian caves was studied. Research focused on unravelling the community structure of epikarst fauna, which is carried away by the trickles of Percolating Water from the epikarst and vadose zones. The major part of the fauna found in Percolating Water is represented by copepods. This fauna, originating in the epikarst, was analysed and by means of the systematic sampling and observation the same groups of animals were found in Slovenian and Romanian caves. Differences among caves and sampling points indicate that epikarst is a heterogenous habitat. Relationship between faunal richness and the physical characteristics of the Water was found. Correlation between surface geomorphology and fauna in Percolating Water was statistically significant in the Postojna cave system.
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biodiversity and ecology of fauna in Percolating Water in selected slovenian and romanian caves biodiverziteta in ekologija favne v prenikli vodi izbranih slovenskih in romunskih jam
2007Co-Authors: Oana Teodora Moldovan, Tanja Pipan, Sanda Iepure, Andrej Mihevc, Janez MulecAbstract:UDC 574.5:551.44(497.4+498) Oana T. Moldovan, Tanja Pipan, Sanda Iepure, Andrej Mi hevc & Janez Mulec: Biodiversity and ecology of fauna in per colating Water in selected Slovenian and Romanian caves Biodiversity and ecology of fauna in Percolating Water from Slo - venian and Romanian caves was studied. Researcfocused on unravelling te community structure of epikarst fauna, wic � is carried away by t � e trickles of Percolating Water from te epikarst and vadose zones. The major part of te fauna found in Percolating Water is represented by copepods. This fauna, originating in te epikarst, was analysed and by means of te systematic sampling and observation te same groups of ani- mals were found in Slovenian and Romanian caves. Differences among caves and sampling points indicate tat epikarst is aet- erogenousabitat. Relationsip between faunal ricness and te pysical caracteristics of te Water was found. Correlation between surface geomorpology and fauna in Percolating wa- ter was statistically significant in te Postojna cave system.